Here's a lovely gallery of old space-themed Rediplete "pediatric syrup" box-art. It's very Mary Blair-esque. Present and Correct notes that it is "via Flickr" but I can't locate a link on the site to the Flickr account where it was found -- if you know, please add to the comments so I can attribute correctly.

Update: this looks like it!, thanks, Uglyredhonda)

A spoonful of sugar. (via The Dieline)